CN204887643U - LED drive circuit with multiple protect function - Google Patents
LED drive circuit with multiple protect function Download PDFInfo
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- CN204887643U CN204887643U CN201520703729.5U CN201520703729U CN204887643U CN 204887643 U CN204887643 U CN 204887643U CN 201520703729 U CN201520703729 U CN 201520703729U CN 204887643 U CN204887643 U CN 204887643U
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Abstract
The utility model relates to a LED drive circuit with multiple protect function, including constant -current source circuit, current mirroring circuit and load, adopt the pulse width modulation signal to adjust luminance, and the low power dissipation, can realize incessant illumination, take excess temperature protect function. Rectifier circuit links to each other with the one end of control by temperature change circuit, and the other end of control by temperature change circuit links to each other with sampling circuit. Bleeder circuit's one end links to each other with sampling circuit, and the other end links to each other with voltage -controlled circuit. The one end of voltage -controlled circuit links to each other with the load.
Description
Technical field
The utility model relates to a kind of drive circuit, is a kind of LED drive circuit with multi-protective function in particular.
Background technology
The design of the protective circuit of LED drive circuit, object be by optimized driving circuit structure to extend LED useful life, avoid dangerous generation.Protective circuit to the stability of LED circuit, the raising in LED useful life and whether energy-conservation there is substantial meaning.LED in use can produce a large amount of heat energy, and these heat not only can cause utilization rate of electrical low, even can burn electric wire and LED, cause danger, so the Thermal protection of LED circuit is necessary.And in circuit, there is various interference; interference can cause the change of transmission voltage; if there is crest voltage to exceed the breakdown region of LED; LED can be burnt; and long-term high voltage can make the brightness of LED too high; useful life shortens, and in order to extend LED useful life, will carry out overvoltage protection to LED.
Summary of the invention
The technical problem that the utility model mainly solves is to provide a kind of LED drive circuit with multi-protective function, possesses overvoltage protection and overheat protector function, effectively improves the stability of circuit, improves the useful life of LED.
For solving the problems of the technologies described above, a kind of LED drive circuit with multi-protective function of the utility model, comprises constant-current source circuit, current mirroring circuit and load; pulse width modulating signal is adopted to carry out light modulation; and low in energy consumption, can continuous illumination be realized, band overheat protector function.
Rectification circuit is connected with one end of temperature control circuit, and the other end of temperature control circuit is connected with sample circuit.One end of bleeder circuit is connected with sample circuit, and the other end is connected with voltage-controlled circuit.One end of voltage-controlled circuit is connected with load.
Described rectification circuit is made up of rectifier D1.
Described temperature control circuit is made up of thermoswitch W1.
Described sample circuit is made up of capacitor C1.
Described bleeder circuit is made up of resistance R1, resistance R2, resistance R3 and electric capacity C2.Resistance R1, resistance R2 and resistance R3 are connected in series.One end of electric capacity C2 is connected to one end of rectifier D1, and the other end is connected between resistance R1 and resistance R2.
Described voltage-controlled circuit is made up of source of stable pressure Q1, voltage stabilizing didoe DZ1, metal-oxide-semiconductor QS1 and resistance R4.A connecting terminals of source of stable pressure Q1 is connected between resistance R1 and resistance R2, and a terminal is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1.A terminal of voltage stabilizing didoe DZ1 is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1.One end of resistance R4 is connected with the grid of metal-oxide-semiconductor QS1, and the other end is connected with thermoswitch W1.The source electrode of metal-oxide-semiconductor QS1 is connected with rectifier D1.
Described load is made up of resistance R0, resistance R5, metal-oxide-semiconductor QS2 and light-emitting diode D2.One end of resistance R0 is connected with the drain electrode of metal-oxide-semiconductor QS1, other end ground connection.The grid of metal-oxide-semiconductor QS2 is connected with the drain electrode of metal-oxide-semiconductor QS1, and the drain electrode of metal-oxide-semiconductor QS2 is connected with light-emitting diode D2, and the source electrode of metal-oxide-semiconductor QS2 is connected with resistance R5, resistance R5 one end ground connection.
As the further optimization of this programme, the rectifier D1 described in a kind of LED drive circuit with multi-protective function of the utility model is bridge rectifier.
As the further optimization of this programme, the source of stable pressure that the source of stable pressure Q1 described in a kind of LED drive circuit with multi-protective function of the utility model selects Texas Instruments, Inc to produce, its model is TL431.
As the further optimization of this programme, the voltage stabilizing didoe that the voltage stabilizing didoe DZ1 described in a kind of LED drive circuit with multi-protective function of the utility model selects En Zhi Pu Semiconductor Co., Ltd to produce, its model is BZV55B15.
The beneficial effect of a kind of LED drive circuit with multi-protective function of the utility model is:
A. overheat protector and over-voltage protecting function is possessed;
B. the useful life of LED is extended.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and specific implementation method, the utility model is described in more detail.
Fig. 1 is the circuit block diagram of a kind of LED drive circuit with multi-protective function of the utility model.
Fig. 2 is the circuit diagram of a kind of LED drive circuit with multi-protective function of the utility model.
Embodiment
In Fig. 1,2, a kind of LED drive circuit with multi-protective function of the utility model, comprises constant-current source circuit, current mirroring circuit and load, adopts pulse width modulating signal to carry out light modulation, and low in energy consumption, can realize continuous illumination, band overheat protector function.
Rectification circuit is connected with one end of temperature control circuit, and the other end of temperature control circuit is connected with sample circuit.One end of bleeder circuit is connected with sample circuit, and the other end is connected with voltage-controlled circuit.One end of voltage-controlled circuit is connected with load.
Rectification circuit is made up of rectifier D1.Rectifier D1 is bridge rectifier.AC conversion is direct current by rectifier D1 is that light-emitting diode D2 powers.
Temperature control circuit is made up of thermoswitch W1.Thermoswitch W1 can disconnect when temperature exceeds higher limit, and circuit is disconnected, and light-emitting diode D2 extinguishes.Time below temperature drops back to higher limit, thermoswitch W1 closes, and light-emitting diode D2 is luminous.
Sample circuit is made up of capacitor C1.When temperature is too high, circuit disconnects, and capacitor C1 discharges, and for light-emitting diode D2 powers, light-emitting diode D2 slowly extinguishes.Temperature lower than in limited time, circuit closes, and capacitor C1 charges.And capacitor C1 provides galvanic current pressure for light-emitting diode D2.
Bleeder circuit is made up of resistance R1, resistance R2, resistance R3 and electric capacity C2.Resistance R1, resistance R2 and resistance R3 are connected in series.One end of electric capacity C2 is connected to one end of rectifier D1, and the other end is connected between resistance R1 and resistance R2.
The source of stable pressure that source of stable pressure Q1 selects Texas Instruments, Inc to produce, its model is TL431.Voltage-controlled circuit is made up of source of stable pressure Q1, voltage stabilizing didoe DZ1, metal-oxide-semiconductor QS1 and resistance R4.A connecting terminals of source of stable pressure Q1 is connected between resistance R1 and resistance R2, and a terminal is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1.State the voltage stabilizing didoe that voltage stabilizing didoe DZ1 selects En Zhi Pu Semiconductor Co., Ltd to produce, its model is BZV55B15.A terminal of voltage stabilizing didoe DZ1 is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1.One end of resistance R4 is connected with the grid of metal-oxide-semiconductor QS1, and the other end is connected with thermoswitch W1.The source electrode of metal-oxide-semiconductor QS1 is connected with rectifier D1.
Load is made up of resistance R0, resistance R5, metal-oxide-semiconductor QS2 and light-emitting diode D2.One end of resistance R0 is connected with the drain electrode of metal-oxide-semiconductor QS1, other end ground connection.The grid of metal-oxide-semiconductor QS2 is connected with the drain electrode of metal-oxide-semiconductor QS1, and the drain electrode of metal-oxide-semiconductor QS2 is connected with light-emitting diode D2, and the source electrode of metal-oxide-semiconductor QS2 is connected with resistance R5, resistance R5 one end ground connection.
When input voltage is at normal value, resistance R1, resistance R2 and resistance R3 play dividing potential drop effect, and make the source of stable pressure Q1 terminal be connected between resistance R1 and resistance R2 obtain the voltage being less than 2.5V, source of stable pressure Q1 is in high-impedance state.Current flowing resistance R4, and through voltage stabilizing didoe DZ1 voltage stabilizing, make metal-oxide-semiconductor QS1 grid obtain 15V cut-in voltage, metal-oxide-semiconductor QS1 conducting, light-emitting diode D1 works.When input voltage is too high, metal-oxide-semiconductor QS1 conducting, make metal-oxide-semiconductor QS1 grid be pulled to electronegative potential, metal-oxide-semiconductor QS1 turns off, and light-emitting diode D1 does not work, and when input voltage recovers normal, light-emitting diode D1 resumes work.
Certainly; above-mentioned explanation is not limitation of the utility model; the utility model is also not limited only to above-mentioned citing, the change that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also belongs to protection range of the present utility model.
Claims (4)
1. the LED drive circuit with multi-protective function, comprise rectification circuit, temperature control circuit, sample circuit, bleeder circuit, voltage-controlled circuit and load, it is characterized in that: rectification circuit is connected with one end of temperature control circuit, the other end of temperature control circuit is connected with sample circuit; One end of bleeder circuit is connected with sample circuit, and the other end is connected with voltage-controlled circuit; One end of voltage-controlled circuit is connected with load;
Described rectification circuit is made up of rectifier D1;
Described temperature control circuit is made up of thermoswitch W1;
Described sample circuit is made up of capacitor C1;
Described bleeder circuit is made up of resistance R1, resistance R2, resistance R3 and electric capacity C2; Resistance R1, resistance R2 and resistance R3 are connected in series; One end of electric capacity C2 is connected to one end of rectifier D1, and the other end is connected between resistance R1 and resistance R2;
Described voltage-controlled circuit is made up of source of stable pressure Q1, voltage stabilizing didoe DZ1, metal-oxide-semiconductor QS1 and resistance R4; A connecting terminals of source of stable pressure Q1 is connected between resistance R1 and resistance R2, and a terminal is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1; A terminal of voltage stabilizing didoe DZ1 is connected with rectifier D1, and a terminal is connected with the grid of metal-oxide-semiconductor QS1; One end of resistance R4 is connected with the grid of metal-oxide-semiconductor QS1, and the other end is connected with thermoswitch W1; The source electrode of metal-oxide-semiconductor QS1 is connected with rectifier D1;
Described load is made up of resistance R0, resistance R5, metal-oxide-semiconductor QS2 and light-emitting diode D2; One end of resistance R0 is connected with the drain electrode of metal-oxide-semiconductor QS1, other end ground connection; The grid of metal-oxide-semiconductor QS2 is connected with the drain electrode of metal-oxide-semiconductor QS1, and the drain electrode of metal-oxide-semiconductor QS2 is connected with light-emitting diode D2, and the source electrode of metal-oxide-semiconductor QS2 is connected with resistance R5, resistance R5 one end ground connection.
2. a kind of LED drive circuit with multi-protective function according to claim 1, is characterized in that: described rectifier D1 is bridge rectifier.
3. a kind of LED drive circuit with multi-protective function according to claim 1, it is characterized in that: the source of stable pressure that described source of stable pressure Q1 selects Texas Instruments, Inc to produce, its model is TL431.
4. a kind of LED drive circuit with multi-protective function according to claim 1, is characterized in that: the voltage stabilizing didoe that described voltage stabilizing didoe DZ1 selects En Zhi Pu Semiconductor Co., Ltd to produce, and its model is BZV55B15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520703729.5U CN204887643U (en) | 2015-09-11 | 2015-09-11 | LED drive circuit with multiple protect function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520703729.5U CN204887643U (en) | 2015-09-11 | 2015-09-11 | LED drive circuit with multiple protect function |
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| CN204887643U true CN204887643U (en) | 2015-12-16 |
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| CN201520703729.5U Expired - Fee Related CN204887643U (en) | 2015-09-11 | 2015-09-11 | LED drive circuit with multiple protect function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11032896B2 (en) | 2019-08-28 | 2021-06-08 | Chicony Power Technology Co., Ltd. | Control apparatus for light emitting diodes |
-
2015
- 2015-09-11 CN CN201520703729.5U patent/CN204887643U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11032896B2 (en) | 2019-08-28 | 2021-06-08 | Chicony Power Technology Co., Ltd. | Control apparatus for light emitting diodes |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160803 Address after: 100096 Beijing Building Materials West Road, building No. 50, South District, room 2, No. 2014, Haidian District Patentee after: BEIJING TIMES HAODING TECHNOLOGY Co.,Ltd. Address before: Nanhua road Tianhe street 325025 Zhejiang Province, Wenzhou City Economic and Technological Development Zone No. 15 Building 5 Patentee before: Wang Liangyuan |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 100095, 2, 1, unit 201-1, 10 building, No. 1, Gao Li Zhang Road, Haidian District, Beijing. Patentee after: Zhongke Haoding Science and Technology Co.,Ltd. Address before: 100096 room 2014, South Building 2, 50 West Building Road, Haidian District, Beijing. Patentee before: BEIJING TIMES HAODING TECHNOLOGY Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20210911 |